US Patent 11525998 Endoscope objective lens unit and endoscope
Patent 11525998 was granted and assigned to Hoya Corporation on December, 2022 by the United States Patent and Trademark Office.
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Patent Inventor Names
Hiroaki Fujii0
Sachiko Nasu0
Edits on 4 Apr, 2023
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Patent Citations
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US Patent 11525998 Endoscope objective lens unit and endoscope
Article
The objective lens unit includes, a front lens group having a negative refractive power, a diaphragm, and a rear lens group having a positive refractive power, in order from an object side. The front lens group includes a negative lens having a concave surface facing an image surface side, and a positive lens having a convex surface facing the object side, and the rear lens group includes a positive lens having a convex surface facing the image surface side and a cemented lens in which a positive lens and a negative lens are cemented. The endoscope objective lens unit satisfies −1.6<f
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Is a
Patent Applicant
Current Assignee
Patent Jurisdiction
Patent Number
115259980
Date of Patent
December 13, 2022
0Patent Application Number
166459730
Date Filed
September 7, 2018
0Patent Citations
Patent Primary Examiner
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